System and method for audio control

ABSTRACT

The present invention comprises a system that provides a convenient and easy-to-use means for controlling audio input and output for recording. The system includes a first input adapted to receive a high fidelity microphone such as a low impedance microphone, and a second input adapted to receive a musical instrument. The system also includes at least two outputs, each adapted to transmit analog signals to an input of a sound card ( 30 ) of a computer ( 20 ), and electrical circuitry coupling the inputs to the outputs. More specifically, the system further comprises at least one additional input adapted to receive analog signals from an output of the sound card ( 30 ) and at least one additional output adapted to transmit analog signals to a receiver. The electrical circuitry couples the additional input to the additional output, and is operable to transmit analog signals from the first and second inputs to the receiver and to the input of the sound card( 30 ). The electrical circuitry is further operable to resistively isolate the analog signals transmitted from the output of the sound card ( 30 ) from the input of the sound card( 30 ).

PRIORITY CLAIM

[0001] This application claims priority benefit under 35 USC 120 toco-pending U.S. Patent Application entitled “System and Method for AudioControl,” Ser. No. 09/439,937, filed Nov. 12, 1999.

RELATED APPLICATION

[0002] This application is related to co-pending U.S. Patent Applicationentitled “System and Method for Audio Control,” filed Sep. 2, 2003.

TECHNICAL FIELD OF THE INVENTION

[0003] This invention relates to information handling systems,specifically to a system and method for audio control.

BACKGROUND OF THE INVENTION

[0004] Information handling systems or computers are commonly used withsound cards to provide audio capability. Such sound cards are typicallyused in conjunction with an operating system and music applicationsoftware. These sound cards have a coder/decoder or analog-to-digitaland digital-to-analog conversion capability. Such a capability allowstranslation between the digital signals utilized by the computer andanalog input or output audio signals. Computer users can thus record andenhance analog audio signals by utilizing the music application softwareto further process the digitized audio signals or by mixing in otherdigital or digitized signals. In this way, users can produce multi-mediaproducts such as music, advertisements, and sound effects for playbackor for storing to mass media for distribution.

[0005] This type of computer-based sound card audio input and outputsystem has typically suffered from a number of disadvantages. Forexample, these systems suffer from the disadvantage that additionaladapters are required in order to use a number of components required tosimultaneously proof and monitor a production of a multi-media product.For example, the use of high fidelity microphones such as XLR type lowimpedance microphones, line-level inputs, and MIDI inputs and outputsrequires additional adapters.

[0006] One approach, described in U.S. Pat. No. 5,630,175, provided foradding audio inputs into a stereo computer system. This design requiresthe use of an additional sound card. Another disadvantage to thisapproach is that the microphones that may be used with such a system arelimited to those that are low-fidelity or low quality. In an effort toovercome these disadvantages, audio mixing consoles must be used topreamplify low impedance microphone inputs or to use more than one inputsimultaneously. For example, in order to mix a microphone and a guitarinto a recording, an audio mixing console must typically be used. Yetanother disadvantage is that this approach does not provide a way tohear the playback or a way to control the music application softwarewhile away from the computer. Another disadvantage is that this approachmay not effectively isolate signals from the sound card, and a user maynot monitor and playback the same stereo inputs and outputs whilerecording, without re-recording the combined signals output from thesound card through the input of the sound card.

[0007] Therefore, a need has arisen for a system and method for audiocontrol that overcomes the disadvantages and deficiencies of the priorart.

SUMMARY OF THE INVENTION

[0008] In accordance with the present invention, a system and method foraudio control are provided which may substantially eliminate or reducethe disadvantages and problems associated with prior devices used incontrolling audio input and output.

[0009] The present invention comprises an adapter that provides aconvenient and easy-to-use means for controlling audio input and outputfor recording. In accordance with one aspect of the invention an audiocontrol system has a first input, each adapted to receive a highfidelity microphone, such as a low impedance microphone, and a secondinput adapted to receive a musical instrument. The system also has atleast two outputs, each adapted to transmit analog signals to an inputof a sound card of a computer, and electrical circuitry coupling theinputs to the outputs.

[0010] In another embodiment, the system has an additional input adaptedto receive analog signals from an output of the sound card, and at leastone additional output adapted to transmit analog signals to a receivertogether with electrical circuitry coupling the additional input to theadditional output. The electrical circuitry is operable to transmitanalog signals from the first and second inputs to the receiver and tothe input of the sound card, the electrical circuitry further operableto resistively isolate the analog signals transmitted from the output ofthe sound card from the input of the sound card.

[0011] In another embodiment, the system has a controller input adaptedto receive a recording controller, and a controller output adapted tocouple to the computer together with electrical circuitry coupling thecontroller input to the controller output.

[0012] In accordance with another aspect of the present invention, amethod is disclosed for controlling audio input and output. The methodincludes coupling a first input adapted to receive a high fidelitymicrophone to a first channel of a sound card of a computer. The methodthen couples a second input adapted to receive a musical instrument to asecond channel of the sound card. In a further embodiment, the methodfurther comprises coupling a MIDI device to the computer.

[0013] The present invention may also permit playback while recording,while eliminating feedback of combined signals output from the soundcard back to the input of the sound card, so that they are notre-recorded. Another technical advantage is a method for audio controlthat does not rely entirely on software controls. Another technicaladvantage of the present invention is a method that allows the use ofhigh-fidelity recording equipment without the need for additionalcomplex mixing circuitry or adapters.

[0014] A further technical advantage of the present invention is asystem that allows for remote control and monitoring of a recordingsession. Another technical advantage of the present invention is anadapter that permits hands-free control and quick and convenient accessto inputs, outputs and controls for a recording session.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] For a more complete understanding of the present invention, theobjects and advantages thereof, reference is now made to the followingdescriptions taken in connection with the accompanying drawings inwhich:

[0016]FIG. 1 is a block diagram of an audio control system of thepresent invention;

[0017]FIG. 2A is a front view of an audio control system of the presentinvention;

[0018]FIG. 2B a back view of an audio control system shown in FIG. 1;

[0019]FIGS. 2C and 2D illustrate another embodiment of an audio controlsystem using the teachings of the present invention;

[0020]FIG. 3 illustrates one embodiment for a hand controller that maybe used in the embodiment in FIG. 1;

[0021]FIG. 4 illustrates one embodiment for a foot controller that maybe used in the embodiment in FIG. 1;

[0022]FIG. 5A illustrates a preferred embodiment for electricalcircuitry that may be used to couple inputs to outputs for channel oneof an audio input and output adapter;

[0023]FIG. 5B illustrates another embodiment for electrical circuitrythat may be used to couple inputs to outputs for channel one of an audioinput and output adapter;

[0024]FIGS. 6A and 6B illustrate a preferred embodiment for electricalcircuitry that may be used to couple inputs to outputs of an audio inputand output adapter; and

[0025]FIGS. 7A and 7B illustrate one embodiment for a headset andelectrical circuitry that may be used in the embodiment in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention and its advantages are best understood byreferring to FIGS. 1-7B of the drawings, like numerals being used forlike and corresponding parts of the various drawings.

[0027]FIG. 1 is a block diagram of an audio control system of thepresent invention. Audio control system 10 comprises a standard computer20 coupled to audio input and output (I/O) adapter 40. Various audioinput devices such as a high-fidelity, low impedance microphone 110,high-fidelity, high impedance device 120 such as a microphone,phonograph input, or musical instrument for example a guitar, andMusical Instrument Digital Interface (MIDI) piano keyboard 60 arecoupled to computer 20 through audio I/O adapter 40. Similarly, audioout devices, such as stereo headphones 80,100 are also coupled tocomputer 20 through audio I/O adapter 40. Foot controller 51 and handcontroller 52 control the operation of system 10 via audio I/O adapter40. Headset 700 may also be coupled to computer 20 through audio I/Oadapter 40. Audio control system 10 allows a user to quickly andconveniently access many of these inputs, outputs, and controls at thefront of computer 20 or audio I/O adapter 40. These inputs, outputs andcontrols are discussed below in further detail.

[0028] Computer 20 includes such typical components as standard soundcard 30, processor 25, memory or disk storage 23, mouse 35, keyboard 36,and monitor 45.

[0029] Audio I/O adapter 40 is described in further detail inconjunction with FIGS. 2A and 2B. A second embodiment for audio I/Oadapter 40 is described in conjunction with FIGS. 2C and 2D. Controllerssuch as hand controller 52 and foot controller 51 are described infurther detail in conjunction with FIGS. 3 and 4. Electrical circuitryused in audio I/O adapter 40 is described in conjunction with FIGS.5A-6B. Electrical circuitry used to couple handset 700 to audio I/Oadapter is described in conjunction with FIGS. 7A and 7B.

[0030] In operation, a user can utilize audio control system 10 forrecording by controlling computer 20, utilizing a compatible operatingsystem and music application software. For example, the user maysimultaneously record guitar, voice, and a MIDI input such as trumpets.The user may do so by selecting an internal soundbank or soundfont inthe music application software using MIDI keyboard 60, mouse 35, orASCII keyboard 36, while viewing monitor 45.

[0031] For example, the user may releasably couple a musical instrumentsuch as guitar 120 and high-fidelity, XLR microphone 110 into front viewof chassis 200 of audio I/O adapter 40, as shown in FIG. 2A. Audiocontrol system 10 permits the user to hear and monitor the voice,guitar, and trumpets being recorded by means of stereo headphone 80,which is releasably coupled to audio adapter 40. In this embodiment,guitar 120 will be heard on one side (channel one) and the voice on theother (channel two). Then, for example, trumpets from MIDI keyboard 60may be heard in both channels of headphone 80.

[0032] The user can also control recording of such audio inputs withoutbeing seated near computer 20 by using suitable controllers, such asfoot controller 51 and hand controller 52. For example, to playback,undo, or edit the recording after the session is finished, either handcontroller 52 or ASCII keyboard 36 may be used in conjunction with mouse35 and monitor 45. Hand controller 52 and foot controller 51 arediscussed in further detail in conjunction with FIGS. 3 and 4. The usercan also perform telephone calls without being seated near computer 20by using headset 700, which is discussed in further detail inconjunction with FIGS. 7A and 7B.

[0033] It is within the scope of the invention for audio control system10 to permit more than one user to simultaneously record and monitor arecording session. In addition, the user may record additionalinstrument tracks that may later be edited into the recording. Further,other embodiments of audio control system 10 may permit simultaneousrecording of multiple instruments such as guitar 120. The user may useaudio control system 10 to make an audio recording that can be saved onany suitable storage media device, including, but not limited to CDs,and other suitable optical and magnetic media. Such suitable devices maybe coupled to computer 20 and may include devices that are adapted toreceive videos, cassettes, CDs, or other mass media storage systems.Coupling of such devices to computer 20 is discussed in further detailin conjunction with FIG. 6.

[0034]FIGS. 2A and 2B show front and back views of one embodiment ofaudio control system 10 of the present invention. Audio I/O adapter 40has digital control inputs such as MIDI IN 206, audio inputs such as LOZ 209, Hi Z 210, audio outputs such as stereo headphone jacks 208,readouts 212, 230 and various control switches 207, 270 and 280, all ofwhich are integrated into the chassis 200 of computer 20, as shown inFIGS. 2A and 2B. Computer 20 has electronic control cards 202, CD ROMdrive 204, and disk drive 203. Electronic control cards 202 includemotherboard 214, sound card 30, and various other application specificcards 218, 220 and 222.

[0035] It is also within the scope of the invention for audio controlsystem 10 to comprise an audio I/O adapter 40 which is not integratedwith computer 20. Audio I/O adapter 40 as shown in FIG. 1 also comprisesa plurality of inputs and outputs adapted to transmit signals to andfrom computer 20 (not explicitly shown), and electrical circuitrycoupling the inputs to the outputs (not explicitly shown). Such inputsand outputs and circuitry are discussed in conjunction with FIGS. 5A-6B.

[0036]FIG. 2A is a front view of audio control system 10 of the presentinvention. Computer 20 typically includes data control inputs 205 forreleasably coupling to mouse 35 and keyboard 36. Additional devices suchas hand controller 52 and foot controller 51 can also releasably coupleto input 205. Headset 700 may also releasably couple to an input 701(notexplicitly shown), as discussed in conjunction with FIGS. 7A and 7B. Theuser may use CD ROM drive 204 and/or disk drive 203 for reading orwriting to and from audio control system 10.

[0037] In this embodiment, audio adapter 40 comprises a plurality ofinputs, outputs and readouts for a first and a second stereo channel ofaudio I/O adapter 40, channels one and two. Each of the inputs 206, 209,and 210 comprises a receptacle adapted to releasably couple to asuitable analog or digital audio input device. Such receptacles areknown to those skilled in the art. For example, digital input 206 mayreleasably couple to MIDI piano keyboard 60, and inputs 209 mayreleasably receive high-fidelity, balanced and non balanced lowimpedance microphones 110 for channels one and two. One such microphone110 may be an XLR type.

[0038] Similarly, audio input 210 may releasably receive high-fidelity,balanced and non balanced high impedance microphones, as well as musicalinstruments such as guitar 120 for channels one and two. Audio input 210desirably provides a wide range of gain control to accommodate suchinput devices. In this embodiment, inputs 210 are standard one-quarterinch phone jacks that may releasably receive suitable devices forproviding high quality audio inputs.

[0039] Audio receivers such as for example, stereo speakers orheadphones 80 and 100 can releasably couple to audio outputs 208.Outputs 208 may be any suitable receptacles, such as standard stereoheadphone jacks for providing two-channel playback capability. The usermay control the volume of audio playback into headphones 80 and 100 byany suitable control switch, such as rotatable knobs 207.

[0040] In this embodiment, separate and identical readouts 212 providedfor monitoring and controlling desired gain and volume in channels oneand channel two. Thus, knobs 270 and 280 control the audio input volumeand gain, respectively.

[0041] One embodiment for readouts 212 is a standard volume unit (VU)decibel meter. Such meters enable the user to visually verify andcontrol desirable volume and gain for a channel. Readout displays can begraphically changed by switch 263, audio overload or clipping isverified by indicators 230, and may be reset by button 262. Any suitablereadout 212 such as a VU meter may be used for its ease andaccessibility. Such readouts do not take up display space on monitor 45,and are not as sluggish to respond as software-controlled meters. Suchreadouts can be controlled by a number of suitable mechanical orelectrical control switches, knobs, buttons, or levers.

[0042] The user may also select between line-level inputs 209, 210, and305, and preamplified inputs for channels one and two, by utilizingselector switches 260. Such inputs are discussed in further detail inconjunction with FIG. 2B.

[0043]FIG. 2B is a back view of audio control system 10 of the presentinvention. Audio control system 10 includes audio inputs and outputs, inaddition to typical communication ports and elements found in computer20.

[0044] In this embodiment, separate and identical audio inputs andoutputs are provided for channels one and channel two. Each of the audioinputs and outputs 301-306, 381, 380 comprises a receptacle adapted toreleasably couple to a suitable digital audio control input or outputdevice. Such receptacles are known to those skilled in the art. Forexample, input/outputs 380 and 381 provide two-way MIDI communicationsto audio control system 10.

[0045] Audio inputs 301, 305 are adapted to releasably receive suitableline-level audio inputs that are typically used for signals that neednot be processed or amplified for gain or volume adjustment. Similarly,inputs 303 provide the user the capability to receive audio input froman external sound card (not explicitly shown). Similarly, outputs 302,304, and 306 releasably couple to suitable line-level audio outputs.Outputs 302 may releasably couple to line-level combined audio outputsignals, which are summed and may be subject to minimal cross-talk noisein pre mix stages, so that the user may monitor them, for example, withstereo headphones 80. In this embodiment, all of these inputs andoutputs are standard phono jacks.

[0046] It is within the scope of the invention to include additionalinputs and outputs 390, 205 to provide for additional monitors 45, mouse35, keyboards 36, hand controllers 52 and foot controllers 51. Suchadditional devices facilitate ease of recording and control of musicapplication software at a separate location from computer 20. It is alsowithin the scope of the invention for audio I/O adapter 40 to includesuitable inputs and outputs that are compatible with wirelesstechnology. For example, one embodiment for audio I/O adapter 40 mayinclude an infrared detector to permit wireless coupling of asuitably-adapted wireless mouse 35 to audio I/O adapter 40.

[0047] A plurality of communication input/outputs provides releasablecoupling for suitable standard input and output communication devices toaudio I/O adapter 40. For example, audio I/O adapter 40 supports aparallel printer at port 352 a, a SCSI input/output bus at port 351 a,and serial communications at ports 350 a and 353 a. Ports 350 a and 353a utilize universal and asynchronous receiver/transmitter (UART)circuitry. At least two monitors 45 may be releasably coupled to videoinput/outputs 390.

[0048]FIGS. 2C and 2D illustrate front and back views, respectively, foranother embodiment of audio I/O adapter 40. Similar to the embodimentsshown in FIGS. 2A and 2B, this embodiment of audio I/O adapter 40includes audio inputs such as LO Z 209, Hi Z 210, audio outputs such asstereo headphone jacks 208, readouts 212 and various control switches260-280, all of which are integrated into a chassis 200A.

[0049] Audio I/O adapter 40 may releasably couple to sound card 30 ofcomputer 20 (not explicitly shown) at stereo receptacles 660A and 670A.Inputs and outputs 660 and 670 to sound card 30 are further discussed inconjunction with FIG. 5A. Audio I/O adapter 40 may also releasablycouple to input/output 610 of computer 20 at receptacle 610A for MIDIinput and output. MIDI interface circuitry is further discussed inconjunction with FIG. 6A. Computer 20 has electronic control cards 202which include motherboard 214, sound card 30, and various otherapplication specific cards 218, 220 and 222.

[0050] This embodiment may comprise a subset of the inputs and outputsthat were discussed in conjunction with FIGS. 2A and 2B. In thisembodiment, a user may utilize audio inputs 209-210 and similarlymonitor recording of audio signals by utilizing readouts 212, 230 andcontrols 260-280. One stereo headphone 80, which releasably couple tooutput 208, may be controlled by knob 207. Inputs and outputs 301-306are standard phono jacks and operate as discussed in FIG. 2B.

[0051] Similarly, inputs 205 support a plurality of mouse 35, keyboards36, foot controllers 51 and hand controllers 52. It is also within thescope of this embodiment to include suitable inputs and outputs that arecompatible with wireless technology.

[0052] In the embodiments as shown in FIGS. 2A-2D, audio I/O adapter 40may be enclosed by any suitable chassis 200 or 200A, such as those usedin the manufacture of typical computers, of sufficient size for aplurality of audio inputs, outputs and controls. It is within the scopeof the invention for audio I/O adapter 40 to comprise as few or as manyinputs, outputs, and peripherals such as mass storage devices andmonitors as are needed to support a user's needs. As another example,audio I/O adapter 40 may also be used with a laptop computer 20.

[0053]FIG. 3 illustrates one embodiment for a controller such as handcontroller 52 as shown in the embodiment in FIG. 1. In this embodiment,hand controller 52 is generally rectangularly-shaped and includes aplurality of controls and buttons. Such controls and buttons may behard-wired or programmable, and allow the user to control audio controlsystem 10 while making a recording without the need to be located nearcomputer 20. Such a controller facilitates recording while using audioinput and adapter 40, especially for persons who may be disabled or whoare recording a solo session. The user may utilize hand controller 52 toplayback or undo a recording, or edit unwanted pops or noises. Inconjunction with this process, the user may also utilize monitor 45 andsoftware in computer system 20.

[0054] Hand controller 52 may be releasably coupled to audio I/O adapter40 at receptacle 205 by means of data control cord 460. In thisembodiment, hand controller 52 includes six keys or switches 500 through550. These six switches may be assigned standard recording functions tocontrol application software used in audio control system 10. Switches500 through 550 permit the user to perform standard recording functionssuch as rewind, record, stop, pause, fast forward, and play. Switches500 through 550 may be any standard mechanical or capacitive typeswitches.

[0055] Hand controller 52 may also include a plurality of user-assigned,software programmable keys. In this embodiment, switches 470 through 490are such user-assigned, software programmable keys. These keys may beassignable to perform short cuts, macros, or any other software functionthat the user may typically utilize in operating application software inaudio control system 10. Similarly to buttons 500 through 550, keys 470through 490 may be any standard mechanical or capacitive type switches.

[0056] It is also within the scope of the invention for hand controller52 to be electrically coupled to audio I/O adapter 40 by means of anysuitable wireless circuitry. Hand controller 52 may also be voicecontrolled. Hand controller 52 may be any shape, and suitably large toaccommodate any number of desired switches and controls.

[0057]FIG. 4 illustrates one embodiment for a controller such as footcontroller 51 as shown in the embodiment in FIG. 1. Foot controller 51enables a user to perform basic recording functions without the need todirectly access or be seated next to mouse 35, keyboard 36, or monitor45 of audio control system 10. Use of foot controller 51 also frees upthe user's hands to perform other tasks while recording. Foot controller51 may be releasably coupled to audio I/O adapter 40 at input 205 bymeans of data control cord 580.

[0058] In this embodiment, foot controller 51 comprises depressible footpedal 600, depressible switch 590, and data control cord 580. Footcontroller 51 is generally rectangularly-shaped. In this embodiment,depressible switch 590 corresponds to a software assigned value forrecord. Thus, when a user depresses switch 590, data is transferredthrough data control cord 580 to instruct application software used incomputer system 20 to record audio inputs once switch 590 is depressed.Similarly, when a user is done recording, the user may depress footpedal 600. Depressing foot pedal 600 sends data through data controlcord 580 to instruct sound recording software and computer system 20 toplay back a desired track.

[0059] It is also within the scope of the invention for foot controller51 to be electrically coupled to audio I/O adapter 40 by means of anysuitable wireless circuitry. Foot controller 51 may also be voicecontrolled. Foot controller 51 may be any shape, and suitably large toaccommodate any number of desired controls such as buttons.

[0060] FIGS. 5A-6A illustrate preferred embodiments for electricalcircuitry that may be used in audio I/O adapter 40 to couple inputs andoutputs as discussed in conjunction with FIGS. 1-2D. In this embodiment,such electrical circuitry comprises input selection circuitry A, volumemonitoring circuitry B, output circuitry C, MIDI interface circuitry Gand peripheral interface circuitry J. Input selection circuitry A,volume monitoring circuitry B and output circuitry C are discussed inconjunction with FIGS. 5A and 5B. MIDI interface circuitry G andperipheral interface circuitry J are discussed in conjunction with FIGS.6A and 6B. FIG. 6B illustrates typical devices that may releasablycouple to the circuitry discussed in FIG. 6A.

[0061]FIG. 5A illustrates exemplary coupling of inputs to outputs forchannel one in audio I/O adapter 40 by input selection circuitry A,volume monitoring circuitry B, and output circuitry C. In thisembodiment, inputs and outputs for channel two would be coupled byseparate and identical circuitry A, B, and C. Other embodiments maycouple electrical circuitry for channel one to channel two. Althoughdirect connections are illustrated for various elements, many elementsmay be coupled through other elements without departing from the scopeof the invention.

[0062] Input selection circuitry A is coupled to a plurality ofreceptacles and to volume monitoring circuitry B. Input selectioncircuitry A processes audio signals received at inputs 209, 210, and 305from user-selected input devices, such as high-fidelity, low impedancemicrophone 110, high-fidelity, high impedance microphone or guitar 120,and a line-level audio device.

[0063] Input selection circuitry A processes input audio signals fromeither microphone 110 or instrument 120. Input selection circuitry Aisolates inputs 209 and 210 by means of capacitive and resistivecoupling, and couples the receptacles to user-controllable gain andvolume pre-amplification circuitry. The user may utilize such gain andvolume pre-amplification circuitry to adjust the gain and volume of theaudio signal input to inputs 209 and 210 by using devices such as knobs270 and 280, as discussed in conjunction with FIG. 2A. The audio signalpasses through the pre-amplification circuitry, to volume monitoringcircuitry B. The audio signal may also pass to output 304 for the userto monitor or for external signal effects processing.

[0064] Input selection circuitry A is also operable to select andprocess input audio signals from input 305 by a variety of methods knownto those skilled in the art, such as switch 260. Input 305 is adapted toreceive a line-level audio input signal, which directly couples tovolume monitoring circuitry B.

[0065] In this embodiment, volume monitoring circuitry B comprises anamplifier and circuitry associated with readouts 212, 230 and associatedcontrols, such as a VU meter, indicators 212, 230, button 262, andswitch 263. Volume monitoring circuitry B couples inputs 209, 210, and305 to output 660 and to output circuitry C. Volume monitoring circuitryB may be any suitable circuitry that permits the user to monitorreadouts of the audio inputs such as volume and gain. Output 660 isadapted to releasably couple to the analog input of channel one of soundcard 30 for analog to digital conversion, and for further processing incomputer 20.

[0066] Output circuitry C comprises audio mixing circuitry and volumeamplification circuitry. Output circuitry C is coupled to sound card 30output 670, which is adapted to releasably couple to the output forchannel one of sound card 30. Output circuitry C also couples outputs660, 670 and volume monitoring circuitry B to outputs 208, 302, and 306.Such coupling permits the user to virtually simultaneously listen to anaudio signal as it is processed from inputs 209 and 210, 305 throughinput selection circuitry A and volume monitoring circuitry B, inputs301, 303, 305, and 671, and sound card 30 output 670. The user maylisten to the audio signal using any suitable amplifier, such as stereoheadphones 80 and 100, which comprise two-channel coupling for stereosound. Output circuitry C also directly couples output 670 from theoutput of channel one of sound card 30 for suitable line-level output306. Such an output is typically a standard RCA plug, requires no volumemonitoring, and is discussed in conjunction with FIG. 2B.

[0067] Audio mixing circuitry permits selection and amplification ofsignals received from volume monitoring circuitry B and from signalsreceived from sound card 30. The audio mixing circuitry couples suchinputs through output circuitry C to outputs 302, 208, and 306. Signalsare directly coupled from audio mixing circuitry to any suitableline-level output or amplified by volume amplification circuitry. Suchcircuitry obviates the need for an additional complex mixing console,and resistively isolates signals received from sound card 30 from theinput of sound card 30. In this embodiment, a suitably-sized resistor R2attenuates analog signals transmitted from sound card 30 as they aretransmitted to outputs 208, 302. A second suitable resistor R1 furtherresistively isolates such analog signals from the input of sound card 30by attenuating such analog signals and thus prevents them from beingre-recorded at the input of sound card 30. Similarly, R2 attenuatessignals transmitted from volume monitoring circuitry B and resistivelyisolates them from the output of sound card 30.

[0068] Output circuitry C may also be configured to process additionalsignals. For example, outputs from one channel of additional sound cards(not explicitly shown) may also be processed through audio mixingcircuitry at one or more inputs 671. Further, signals may similarly bedirectly output to input/output 306 and directly input to input 305 forreleasable coupling to such an external sound card. Additional inputssuch as inputs 209, 210 and 305 may also be coupled through additionalor similar input selection circuitry A and volume monitoring circuitry Bto additional inputs 671 in output circuitry C, and to sound card input660. Some or all of these inputs may be, for example, summed ormultiplexed as desired to sound card 30, and are only limited by thecapacity of sound card 30. Alternatively, some or all of these inputsmay also each be coupled to an additional sound card (not explicitlyshown). For each additional input channel processed using additionalinput selection circuitry A and volume monitoring circuitry B, anadditional output channel may also be utilized. For example, each suchadditional output channel may be coupled to output 670 of sound card 30,or to an output of the additional sound card that corresponds to anadditional input channel. In such embodiments, additional resistors R1and R2 may also resistively isolate signals from sound card 30, or anadditional sound card, as previously discussed. These embodiments mayprovide additional flexibility in accessing sound card banks and tocreate custom sound banks using standard, inexpensive sound cards.

[0069]FIG. 5B illustrates another embodiment for electrical circuitrythat may be used to couple inputs to outputs for channel one of an audioinput and output adapter. In this embodiment, audio I/O adapter 40comprises circuitry in addition to the elements described in FIG. 5A.

[0070] For example, in some embodiments of the invention, switch S60 maybe coupled between the input 660 and output 670 of sound card 30, andvolume monitoring circuitry B. Such a configuration allows the user tomonitor both sound card 30 inputs and outputs by using volume monitoringcircuitry B.

[0071] It is also within the scope of the invention to couple andisolate input 660 and output 670 of sound card 30 by suitable means suchas resistors as an alternative to or in addition to switch S60. Such asuitable configuration may allow the user to sum and simultaneouslymonitor all the signals being processed within audio I/O adapter 40.Other suitable isolation methods and circuitry may also be used.

[0072]FIGS. 6A and 6B illustrate a preferred embodiment for electricalcircuitry coupling additional inputs and outputs of audio I/O adapter40. Such electrical circuitry comprises MIDI interface G circuitry andperipheral interface circuitry J, and couples the remaining inputs ofaudio I/O adapter 40 to the remaining outputs. MIDI interface circuitryG couples input/output 610 to input 206, which is adapted to receiveMIDI devices such as piano keyboard 60. Peripheral interface circuitry Jcouples to output 625 inputs 205, which are adapted to receiveadditional keyboards 36, and hand and foot controllers 52 and 51. Suchdevices are illustrated by example in FIG. 6B.

[0073] MIDI interface circuitry G is also operable to coupleinput/output 610 to a plurality of suitable MIDI devices viainput/outputs 206, 380 and 381. Such coupling permits additional accessto other MIDI and MIDI-controlled devices. It is also within the scopeof the invention for such coupling to support direct MIDI to and fromthe Internet via MIDI interface circuitry G.

[0074] In this embodiment, the electrical circuitry used in audio I/Oadapter 40 also directly couples a plurality of input receptacles tooutputs. For example, ports 350 a-353 a are coupled to outputs 350 b-353b, respectively. These inputs and outputs are standard I/O plugs andreceptacles.

[0075] Peripheral interface circuitry J couples inputs adapted toreceive peripherals, such as keyboard 36, to output 625, and furthercouples output 625 to computer 20 at inputs 620, 630 and 640, and output650. For example, peripheral interface circuitry J couples to input 630at least one input 205 a mouse 35. It is also within the scope of theinvention to couple additional devices such as mouse 35 at input 205 toinput 630.

[0076] Peripheral interface circuitry J couples output 625 to input 205a keyboard 36 and a hand controller 52 and/or foot controller 51. It iswithin the scope of the invention for peripheral interface circuitry Jto couple additional devices such as hand controller 52, foot controller51, and keyboard 36 at additional inputs 205 to output 625. Peripheralinterface circuitry J also couples a monitor 45 to inputs and outputs640 and 650 at video input and outputs 390.

[0077] It is within the scope of the invention to couple a plurality ofdevices through SCSI input/output bus port 351 a. Such a plurality islimited only by the processing capacity of computer 20. Such devicesinclude, but are not limited to, devices suitable to read and/or write avariety of media, such as production-quality tape, compact disk, floppydrive media storage, and mass storage. Such expandability facilitatesthe use of audio adapter control system 10 to make sound recordings on alarge scale, and on production-quality media. Such a configuration alsoenvisions the use of audio control system 10 with standard media devicesavailable to most consumers, utilizing technologies as they becomeavailable.

[0078] Furthermore, it is also within the scope of the invention tocouple additional controls, peripherals, and audio and digital inputand/or output channels to audio control system 10. For example,additional monitors 45, keyboards 36, mouse 35, and hand and footcontrollers 52 and 51 are also within the scope of the invention. Suchexpansion is limited only by the underlying software and hardware.

[0079] Other types of processing and input/output may also be used, suchas optical processing and optical buses. Microphone inputs such as 209and 210 may have phantom power. Audio control system 10 may also be usedto perform cancellation functions, which include, for example, removinglead vocal data from recorded stereo soundtracks. Audio control system10 may also comprise additional controls such as parametric equalizers,tone controls, compressor or limiters, effects, and routing.

[0080]FIGS. 7A and 7B illustrate one embodiment for a headset andelectrical circuitry that may be used in the embodiment in FIG. 1.Headset 700 enables a user to communicate using voice communication suchas answering a telephone call, without the need to directly access or beseated next to mouse 35, keyboard 36, or monitor 45 of audio controlsystem 10, and frees up the user's hands to perform other tasks.

[0081] In this embodiment, audio I/O adapter 40 comprises adapter 710,volume monitoring circuitry B2, and switches 720 and 721, in addition tothe elements discussed in detail in FIGS. 5A through 6A. Switch 720couples output 730 of adapter 710 to volume monitoring circuitry B andto the analog input of channel one of sound card 30 for analog todigital conversion, and for further processing in computer 20.Similarly, switch 721 couples the output of channel one of sound card 30to volume monitoring circuitry B2 and to input 731 of adapter 710 toprocess incoming caller signals. As illustrated in FIGS. 7A and 7B,switches 720 and 721 are set to communicate with stereo headset 700.

[0082] Adapter 710 comprises at least one standard audio input 701 toreleasably couple to a suitable analog audio input device such as asuitable multi-pin jack. Adapter 710 may also comprise one or moreadditional controls such as buttons or switches 702 and 703, to providesuitable or user-programmable functions such as call screening orblocking. It is also within the scope of the invention for adapter 710to comprise a standard hook and cradle device (not explicitly shown)device to connect to a standard telephone receiver, in addition to or asan alternative to headset 700. Adapter 710 comprises suitable volumeamplification circuitry to process audio signals to and from sound card30 at output 730 and input 731, respectively. Adapter 710 also comprisessuitable logic coupled to switches 720 and 721 and to output 625, whichmay in some embodiments be coupled to computer 20 at input 620, asillustrated in FIG. 6A. Adapter 710 may also comprise or be coupled tosuitable interface circuitry 736 to process signals to and from input731 and outputs 625 and 730.

[0083] Headset 700 may be releasably coupled to audio I/O adapter 40 atinput 701 by means of a suitable data control cord 704, or may bewirelessly coupled to audio I/O adapter 40. In this embodiment, headset700 may be any suitable device allowing voice communication, such as aheadset as illustrated in FIG. 7B, or a standard telephone receiver.

[0084] In operation, headset 700 may be activated for example, toreceive or place a voice call. One embodiment of the invention mayinclude a sensor 750 coupled to adapter 710 to control switches 720 and721. Sensor 750 may also be coupled to adapter 710 by means of controlcord 704. Sensor 750 may sense a user's presence and inductivelyactivate headset 700. Activation of headset 700 may invoke adapter 710to mute the output of other audio and digital signals present in system10, and may further activate computer software through output 625.Adapter 710 processes audio signals received through adapter 710 andswitch 720 at output 730, and receives audio signals through switch 721at input 731, respectively. It is also within the scope of the inventionfor adapter 710 to comprise suitable logic to redirect signals of otherdevices to headset 700, or to make all inputs and outputs simultaneouslyactive. Such logic may be implemented in software, firmware, orhardware, and may be, for example, manually controlled, to predefine orselect redirection to headset 700 of any number of additional controls,inputs and outputs.

[0085] It is also within the scope of the invention for volumemonitoring circuitry B2 and switches 720 and 721 to reside in adapter710, in addition to or rather than in audio I/O adapter 40. In such anembodiment, adapter 710 may releasably couple to audio I/O adapter 40.Similarly, the elements comprising adapter 710 may be incorporated intoaudio I/O adapter 40. For example, the embodiments as illustrated inFIGS. 2C and 2D may incorporate input 701 and switches 702, 703, tocouple to and control headset 700. Similarly, volume monitoringcircuitry B2, switches 720 and 721 and the circuitry residing in adapter710 may also be suitably incorporated into the circuitry as illustratedand discussed in FIG. 5A.

[0086] While the invention has been particularly shown and described bythe foregoing detailed description, it will be understood by thoseskilled in the art that various other changes in form and detail may bemade without departing from the spirit and scope of the invention.

What is claimed is:
 1. An audio control adapter, comprising: a. inputcircuitry adapted to receive at least one of a microphone and a musicalinstrument at a first input in a first signal channel; b. a first outputadapted to transmit analog signals from the at least one of themicrophone and the musical instrument to a sound card input in the firstsignal channel; c. a second input adapted to receive analog signalstransmitted from a sound card output in the first channel; d. eccoupling the input circuitry and the first output and operable totransmit analog signals from the at least one of the microphone and themusical instrument to output circuitry and to the input of the soundcard, e. a second output in the first signal channel adapted to transmitanalog signals to one of a receiver; and f. wherein the output circuitryis operable to transmit the analog signals from the input circuitry andthe second input to the second output and to resistively isolate theanalog signals transmitted from the second input from the analog signalstransmitted to the first output.
 2. The system of claim 1, furthercomprising: a. a third input adapted to receive analog signals from oneof second output circuitry in a second signal channel and a second soundcard in the second signal channel; and b. wherein the output circuitryis further operable to transmit the analog signals in the second channelto the second output in the first signal channel and to resistivelyisolate the analog signals transmitted from the third input in thesecond signal channel from the analog signals transmitted from thesecond input in the first signal channel.
 3. The system of claim 1,further comprising a third output operable to transmit the analogsignals from the at least one of the microphone and the musicalinstrument in the first signal channel to second input circuitry in athird signal channel, the second input circuitry operable to transmitthe analog signals from the at least microphone and the musicalinstrument to a third sound card in a third signal channel.
 4. Thesystem of claim 1, further comprising monitoring circuitry coupled tothe input circuitry, the first output, and the second input, themonitoring circuitry operable to monitor at least one parameter of theanalog signals transmitted to one of the first output and the secondinput, the monitoring circuitry further operable to resistively isolatethe first output from the second input, the at least one parameterselected from the group consisting of amplitude and frequency.
 5. Thesystem of claim 1, wherein at least one of the input circuitry, thefirst output, the second input, and the output circuitry comprisewireless technology to receive analog signals transmitted via wirelessmedia.
 6. The system of claim 1, wherein the input circuitry and outputcircuitry is further operable to output balanced analog signals.
 7. Thesystem of claim 1, further comprising signal control circuitry coupledto the input circuitry, the signal control circuitry operable to causeat least one control function to be performed on analog signals receivedfrom the first input prior to being transmitted to the first output, thecontrol function selected from the group consisting of parametricequalization of, tone modification of, compression of, limiting of, andincorporating effects to, the analog signals from the first input.
 8. Amethod for audio control, comprising: a. coupling, in a first signalchannel, a first input to a first output and to output circuitry thefirst input operable to receive an analog signals from at least one of amicrophone and a musical instrument, and the first output adapted totransmit the analog signals from the at least one of the microphone andthe musical instrument to a sound card input; b. coupling, in the firstsignal channel, a second input adapted to receive analog signals from asound card output to output circuitry; c. creating resistive isolationin the output circuitry for, in the first signal channel, the analogsignals transmitted from the second input from the analog signalstransmitted to the first output; and d. coupling, in the first signalchannel, the output circuitry to a second output adapted to transmitanalog signals to a receiver.
 9. The method of claim 8, furthercomprising a. coupling a third input adapted to receive analog signalsfrom one of second output circuitry in a second signal channel and asecond sound card in the second signal channel to the output circuitry;and b. the output circuitry being further operable to transmit theanalog signals in the second channel to the second output in the firstsignal channel and to resistively isolate the analog signals transmittedfrom the third input in the second signal channel from the analogsignals transmitted from the second input in the first signal channel.10. The method of claim 8, further comprising coupling a third outputoperable to transmit the analog signals from the at least one of themicrophone and the musical instrument in the first signal channel tosecond input circuitry in a third signal channel, the second inputcircuitry operable to transmit the analog signals from the at leastmicrophone and the musical instrument to a third sound card in a thirdsignal.
 11. The method of claim 8, further comprising couplingmonitoring circuitry to the input circuitry, the first output, and thesecond input, the monitoring circuitry operable to monitor at least oneparameter of the analog signals transmitted to one of the first outputand the second input, the monitoring circuitry further operable toresistively isolate the first output from the second input, the at leastone parameter selected from the group consisting of amplitude andfrequency.
 12. The method of claim 8, further comprising at least one ofthe input circuitry, the first output, the second input, and the secondoutput comprising wireless technology operable to receive analog signalsvia wireless media.
 13. The method of claim 8, further comprising theinput circuitry and output circuitry being further operable to outputbalanced analog signals.
 14. The method of claim 8, further comprisinga. coupling signal control circuitry to the input circuitry; and b.causing at least one control function to be performed in the signalcontrol circuitry on analog signals received from the first input priorto being transmitted to the first output, the control function selectedfrom the group consisting of parametric equalization of, tonemodification of, compression of, limiting of, and incorporating effectsto, the analog signals from the first input.